Ask a household what backup they want and the answer is usually everything. Ask what they actually run between 8pm and midnight and the number is much smaller, much more specific, and far cheaper to serve.
A typical North Indian evening load — fans, lights, television, refrigerator, router, one bedroom air conditioner — sits between 1.5 and 3 kWh over four hours. That is the design input. Capacity beyond it earns nothing on ordinary days and only matters during long outages.
What the hybrid inverter changes
A hybrid inverter arbitrates between three destinations: the house, the battery and the grid. Priority is set in firmware — self-consumption first, then charging, then export. It is the piece that lets a single system do backup and net metering without compromise on either.
Cycles are the currency
A battery earns its cost by cycling. A pack sized twice as large as your evening load cycles half as deeply and takes twice as long to pay for itself, even though it lasts no longer in years.
What to take away
Meera Iyer
Systems engineering
Specifies panels, inverters and battery blocks for RePrime systems, and tests what the datasheets do not mention.
Run these numbers against your own bill
The calculator uses state-wise generation data and the current subsidy slabs. Two inputs, one estimate, no call required.
